The 6 Best 40 Gallon RV Water Tanks (2023 reviews)

The features department is where classacustoms great tank truly manages to shine. If you are doing a concession trailer or any application where you will need to get inspected you should use a fill dish, the kind that goes on the outside of an RV trailer. It's made with nsf international nsf/ansi std 61 approved medium density polyethylene (mdpe) resin with uv-8 stabilization. It comes with a top hole and bottom hole with female threaded plugs.

The power rating (watts for electric or BTU's for gas fired) of an instant water heater will determine the temperature rise for a given flow rate through the heater. It is great for extra water for rv. There is 2 smaller 1/2" threaded fittings and 2 larger 1.5" threaded fittings. It is perfect for boon docking.

Why We Like This:

Better to work with port holes in corners
Fittings preinstalled make for ease of use
You can use plastic fittings and vinyl hose

Best With Trailer: Class A Customs Gray Water Tank

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It's just a plastic fresh water tank. It's made with nsf international nsf/ansi std 61 approved medium density polyethylene (mdpe) resin with uv-8 stabilization. It includes 4 fittings built into the tank. The tank is strong enough, but all the plumbing holes would be on top of the tank.

The tank has both 1/2" and 1.5" female threaded holes at the top and bottom corners. The tank must be vented allowing air in and out during use. It comes with an empty, pour chlorine solution into the tank. It is recommended to use a fill dish or other gravity process.

Why We Like This:

Open windows and doors to get fresh air when you use bleach
Fresh water / drinking water safe
Any residual chlorine odor will dissipate naturally

Best For Well: classacustoms 40 Gallon RV Water Tank

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If you need a budget RV gray tank, this works. It's tough, thick plastic. It is made in a warehouse to clean each tank prior to use to remove any debris, scuffs or marking from the manufacturing process. It has a UV inhibitor to keep it from fading and becoming brittle when left in direct sun light.

This tank is NOT UV protected, keeping it out of prolonged exposure to sunlight. The tank must be vented allowing air in and out during use. It is recommended to use a fill dish or other gravity process.

Why We Like This:

New and hot release
Good brand reputation

Best With Hose: Class A Customs 40 Gallon RV Water Tank

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The tank is well made and the dimensions are well thought out. It is recommended to use a fill dish or other gravity process. It is made in a warehouse to clean each tank prior to use to remove any debris, scuffs or marking from the manufacturing process. The tank must be vented allowing air in and out during use. They have put extra fitting connection spaces so you can use it in several different directions.

Why We Like This:

Size to fit space and have enough room for fittings
Delivers what they promise

Best For concession Trailer: Toughgrade 40 Gallon RV Water Tank

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The toughgrade 40 gallon rv water tank is capable of outshining several other tank featured in this list in overall features in its price range.

Why We Like This:

Good investment for long term
Delivers what they promise

Best With sensor: Alpha systems 40 Gallon RV Water Tank

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Compared with other tank in this category, the alpha systems 40 gallon rv water tank has a convenient design. Alpha Systems blow-molded HDPE tanks are an integral component to all recreational vehicles. It is designed to be laid horizontally, with the plumbing fittings positioned at the lowest point of the body and a small air vent at the top. The uniform thickness of the tanks makes them much more durable than the traditional rotational molded and thermoformed varieties.

The Tank is thinner than factory Rv tanks, but all of the connections and sensors are in place. There are a series of built in sensors for wiring up to your rv’s water level gauge. It does include the studs for the sensors.

Why We Like This: